PM87175: HANDLE EINTR ON SEMOP CALL WHIST STARTING EG ON Z/OS

APAR status

• Closed as program error.

Error description

• When starting an execution group by starting a new address
  space on z/OS the broker creates a semaphore and listens
  on that semaphore for some actions. If when waiting for
  the semaphore actions the semaphore wait is interrupted
  with an EINTR signal, then the broker issues a BIP9241E
  error message with a return code of 120, thinks the
  EG has not started and then tries to restart it. This
  leads to multiple address spaces being started for the
  same execution group. The broker should handle this
  return code and wait again on the semaphore. The following
  error is seen in the broker joblog:
  
  BIP9241E MQ01BRK 43 AN INTERNAL ERROR OCCURRED WITH A
  DATAFLOWENGINE ADDRESS SPACE, RETURNCODE 120,
  REASONCODE 0. : ImbProcess(820)
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of WebSphere Message Broker on z/OS.
  
  
  Platforms affected:
  z/OS
  
  ****************************************************************
  PROBLEM SUMMARY:
  When starting an execution group by starting a new address space
  on z/OS the broker creates a semaphore and listens on that
  semaphore for some actions. If when waiting for the semaphore
  actions the semaphore wait is interrupted with an EINTR signal
  then the broker issues a BIP9241E error message with a return
  code of 120, thinks the EG has not started and then tries to
  restart it. This leads to multiple address spaces being
  started for the same execution group. The broker should handle
  this return code and wait again on the semaphore. The
  following error is seen in the broker joblog:
  
  BIP9241E MQ01BRK 43 AN INTERNAL ERROR OCCURRED WITH A
  DATAFLOWENGINE ADDRESS SPACE, RETURNCODE 120, REASONCODE 0. :
  ImbProcess(820)
  

Problem conclusion

• WebSphere Message Broker has been modified to handle the EINTR
  return code when waiting on the semaphore which is used to
  monitor for successful address space and execution group
  creation.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Platform           v8.0
  --------           --------------------
  Multiplatforms     8.0.0.3
  
  The latest available maintenance can be obtained from
  'WebSphere Message Broker Recommended Fixes'
  http://www.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available, information on
  its planned availability can be found in 'WebSphere Message
  Broker Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEB MB Z/OS

• Fixed component ID

  5697P4400

Applicable component levels

• R800 PSY

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